Plasma leptin concentrations in physically active men and women in relation to fat mass, fat free mass and selected biochemical variables
Journal Title: Biology of Sport - Year 2006, Vol 23, Issue 1
Abstract
The plasma leptin concentration depends on many factors with a substantial role played by physical activity. The aim of this study was the evaluation of the effects of body fat and fat free mass as well circulating glucose and cortisol on plasma leptin concentrations in active men and women. A total of 26 physical education students (13 men and 13 women)- took part in the study. Their physical activity during the study was only thatrequired by theie study program. No one was engaged in high-performance sports. Fasting blood samples were taken from the antecubital vein into lithium heparin tubes and centrifuged to separate plasma specimens. Plasma leptin levels were determined using radioimmunoassay and commercial kits (Linco, USA). Cortisol was determined by means of ELISA method and IBL kits (Germany). Glucose was assayed by the oxidase method using Randox commercial kits (Randox Laboratories, Great Britain). Body fat was estimated using the BIA method (RJL System INC., USA). Despite the lack of difference in fat mass between sexes circulating leptin in women (6.5 ng•ml-1) was significantly higher than in men (2.4 ng•ml-1). Plasma leptin concentrations in both men and women were not correlated with circulating glucose and cortisol. Moreover, neither in men nor in women were they correlated with the percent of body fat. In contrast, in men plasma leptin levels were significantly correlated with fat mass expressed in kilograms (r=0.56; p<0.05). In women circulating leptin was significantly and inversely correlated with the ratio of fat-free mass to fat mass (r=-0.71; p<0.006). Our results indicate that the effect of body fat on plasma leptin concentrations differs in active men and women, probably due to pronounced fat-free mass effects on plasma hormone levels in women but not in men.
Authors and Affiliations
G Lutosławska, B Wit
Keywords
Related Articles
- EP ID EP58868
- DOI -
- Views 97
- Downloads 0
Weight loss is not mandatory for exercise-induced effects on health indices in females with metabolic syndrome
The aim of this study was to investigate the impact of moderate aerobic training on functional, anthropometric, biochemical, and health-related quality of life (HRQOL) parameters on women with metabolic syndrome (MS). Fi...
Reliability of the calculated maximal lactate steady state in amateur cyclists
Complex performance diagnostics in sports medicine should contain maximal aerobic and maximal anaerobic performance. The requirements on appropriate stress protocols are high. To validate a test protocol quality criteria...
ACCEPTED LEVEL OF RISK OF DOPING USE IN THE VIEW OF YOUNG ATHLETES
The paper is a continuation of studies aimed at verifying the hypothesis from decision theory stating that the risk in action is the greatest when the probability of loss is high, and the higher the value attached to tha...
QUERCETIN EFFECTS ON WEIGHT GAIN AND CALORIC INTAKE IN EXERCISED RATS
Quercetin is a flavonoid which activates oxidative metabolism. Quercetin may reduce weight gain by decreasing feed efficiency. The present study aims to evaluate weight gain, caloric intake and feed efficiency in exercis...
Differences in neuromuscular fatigue after aerobic and anaerobic running loads
The aim of the research was to establish some characteristics and differences in neuromuscular fatigue after different running loads. Seven well-trained runners performed two running tasks: an interval run of 5 x 300 m a...